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A level architectural deck may be intended for use by people, e.g., what in the UK is usually called a decked patio. "Roof deck" refers to the flat layer of construction materials to which the weather impervious layers are attached to a form a roof, and they may be either level (for a "flat" rooftop) or sloped.
Ventilation of the roof deck speeds the evaporation of water from leakage or condensation and removes heat which helps prevent ice dams and helps asphalt shingles last longer. Building codes in the U.S. specify ventilation rates as a minimum of 1 sq ft (0.093 m 2 ) of opening per 150 sq ft (14 m 2 ) (1:150) with a ratio of 1:300 in some ...
A hip roof on a varied plan, "h" denotes a hip, "v" denotes a valley. A hip roof is self-bracing, requiring less diagonal bracing than a gable roof. Hip roofs are thus much more resistant to wind damage than gable roofs. Hip roofs have no large, flat, or slab-sided ends to catch wind and are inherently much more stable than gable roofs.
Aside from rooftop gardens providing resistance to thermal radiation, rooftop gardens are also beneficial in reducing rain run off. A roof garden can delay run off; reduce the rate and volume of run off. “As cities grow, permeable substrates are replaced by impervious structures such as buildings and paved roads.
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The 101st floor indoor/outdoor rooftop observation deck opened to the public on June 14, 2019. [4] Two additional observation decks, outdoor on the 91st-floor and indoor on the 89th floor at 383.2 metres (1,257 ft).. 11 CN Tower: 1976 Concrete tower: Toronto: 446.7: 553.3: Two additional observation decks at 342 m (outdoor) & 346 m (indoor). 12 ...